Internal-combustion engine.



W. I. TWOMDLY. INTERNAL COMBUSTION LNGINE. APPLICATION nun 11.19. 1910.

Patented July 11,1911.

Willar BY COLUMBIA PLANOGIAFH to WAsmmmN. D. c,

UNITED STATES PATENT OFFICE;

WILLARD I. TWOMELY, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TO

TWOMIBLY MOTORS COMPANY, OF

NEW YORK, N. Y., A CORPORATION OF NEW YORK.

INTERNAL-COMBUSTION ENGINE.

Patented July 11, 19] 1. Serial No. 556,347.

To all whom it may concern:

Be it known that I, WILLARD Invnsc TwoMnLY, a citizen of the United States, residing in the borough of Manhattan, in the city, county, and State of New York, have invented a new and useful Improvement in Internal-Combustion Engines, of which the following is a specification.

This invention relates to the piston mechanism of internal combustion engines of the type disclosed in my co-pendin application filed February 18, 1910, Seria No. 544,546, and comprising a pair of opposed cylinders substantially in alinement with each other, a double piston working in said cylinders and connected to the crank shaft in the operating portion of the piston, to impart reciprocatory motion to the piston transversely to the axis of the crank-shaft and to permit reciprocatory motion of the crank-shaft wrist relative to the piston transverse to the reciprocatory motion thereof.

It is the object of the present invention to provide an improved double piston whereby to facilitate the assembling and mounting of the same upon the crank shaft, and to provide a piston which is simple and compact in construction and durable and etlicient in operation.

In the drawings accompanying and forming a part of this specification, Figure 1 is a sectional side elevation of my improved piston showing the same connected to a crank shaft. Fig. 2 is a longitudinal sectional plan view of the parts shown in Fig. 1, illustra ting the piston in position in the piston cylinders. Fig. 3 is an end elevation of the piston with the head at the left of Fig. 1 removed. Fig. 4 is an end elevation looking at the left of Fig. 1, showing the manner of securing the releasable head, and Fig. 5 is a sectional end elevation taken on a line substantially midway of Fig. 1 and looking to the right.

Similar characters of reference designate like parts throughout thedifi'erent views of the drawings.

As already stated the present piston is of the type disclosed in my co-pending application filed February 18, 1910, Serial No. 544,546, and for the purpose of the present invention I have only shown a portion of the crank case 1 in which is rotatively mounted a crank-shaft 3 by means of ball bearings 2 of usual construction, a pair of opposed piston-cylinders 4, 5 being secured to said crank case 1 substantially 1n allnement, said cylinders provided with water jackets 6 in the present instance cast integral with the cylinders. For a more detailed description and a clearer illustration of the construction of the crank case and piston cylinder, reference may be had to my (o-pending application hereinbefore referred to.

The piston is in the nature of a double piston, that is, it is so constructed and con nected to the crank shaft as to operate in the opposed cylinders 4, 5, and comprises a pair of heads 7, 8 having the usual rings 9. The head 7 is provided with a sleeve portion 10 cast integral with said head and having a pair of oppositely-disposed openings or slots 11,, extending through the ends thereof to permit slipping of the same on the crank shaft 3 and to also permit reciprocation of the piston transverse to the axis of the crank-shaft as the latter rotates. The head 8 has a lapq'oint connection 12 with the sleeve portion 10 of the head 7, and secured thereto by means of a pair of bolts 13, 13 passing through the head and engaging in screw-threaded ears or lugs 14, 14' on the inner wall of the sleeve portion 10. Adjustably secured to said heads 7, 8 within the piston are a pair of tracks or raceways 15, 16 engaging at opposite sides of a roller bearing 17 on the crank-shaft wrist or offset 22 to permit reciprocatory motion of said wrist transverse to the reciprocation of the piston. The said tracks are secured to the head by means of an adjustable sleeve 18 having a screw-threaded connection 19 with the heads, and the inner ends abutting against the back of the tracks 15, 16 tie-rods 20 passing through said sleeve and having a screw-threaded connection 21 with said tracks. a jam nut engaging the other end thereof to draw the tracks up against the sleeve portion and rigidly maintain them in such position.

To maintain the tracks in proper alinement and reinforce the end portions thereof. I provide alining pins 23, one pair for each track. The alining pins for the track 15 are screw threaded into bosses 24 extending inwardly from the head 7, the ends engaging in sockets or recesses 25 in the track 15, and having jamnuts 26 at their outer ends to lock them in adjusted positions.

Q aomso The alining pins for the track 16 pass through the releasable head and are screw threaded'into bosses 27 on the inner Wall of the sleeve portion 10, said bosses 27 being in alinement with the inwardly-extending bosses 24 on the head 7. The inner ends of the said pins also engage in recesses 25 in the track 16 and have jam-nuts at the other ends thereof outside of the releasable head 8. These pins also serve to connect the head 8 to the sleeve portion 10. To prevent r0- tary motion of the piston, the tracks 15, 16 are provided with guideways or ledges 28 inside of which the bearing 17 on the crankshaft offset travels. In the present instance the orbit of the path of movement of the bearing 17 on the crank shaft wrist is greater than the diameter of the piston, and to permit of the reciprocatory movements of the said hearing within the piston, I rovide a second pair of oppositely-dispose openings 29 in the sleeve portion 10, the said openings 29 being at substantially right angles to the openings 11 in which the crank shaft engages. The ends of the tracks 15, 16 also engage in the openings 29 to prevent any sidewise distortion. Each of the piston heads 7, 8 have recessed portions 30, which recesses in connection with the end wall of the piston cylinders form explosive chambers 31, as shown in Fig. 2 at the left.

In assembling the piston upon the crankshaft the track 15 is first connected to the head 7, when the sleeve portion 10, by means of the openings 11, is slipped over the crank shaft 3, and the head 8 connected to the sleeve portion 10. The track 16 is then secured in place, and the piston cylinders 4, 5 fastened to the crank-case 1.

Having thus described my invention, I claim:

1. In a piston, the combination of a head having an integral sleeve portion, said sleeve provided with a pair of oppositely-disposed openings extending through the end thereof for the passage of a crank shaft, and a second pair of oppositely-disposed openings at substantially right angles to the first mentioned openings; a second head; bolts passing through said head and having a screwthreaded engagement with lugs on the sleeve portion of its companion head to releasably connect said second head to the sleeve portion; raceways or tracks Within the sleeve portion to engage at opposite sides -,of the crank-shaft Wrist and whereby the piston is connected to the crank shaft, the ends of said "tracks engaging in the last mentioned openingsfand means for adjustably securing said raceways to the piston heads, comprising sleeves one end of which has a screw threaded engagement with the piston heads and the other ends abutting against the tracks, tie-rods passing through said sleeves and having a screw threaded connection with the tracks, said rods projecting through the piston heads and having jam nuts thereon outside of the piston heads to draw the tracks against the sleeves to maintain the tracks in rigid position.

2. In a piston, the combination of a head having an integral sleeve portion and a pair of inwardly-extending lugs, the said sleeve provided with a pair of oppositelydisposed openings cut through the end thereof for the passage of a crank shaft, and a second pair of oppositely-disposed openings substantially at right angles to the first mentioned openings; said sleeve also having a pair of inwardly-projecting lugs in alinement with the lugs on the head; a second head releasably connected to the sleeve portion; raceways or tracks within the sleeve portion to engage at opposite sides of the crank-shaft wrist and whereby the piston is connected to the crank-shaft, the ends of said tracks engaging in the last-mentioned openings; means for adj ustably securing said raceways to the piston heads, comprising sleeves one end of which have a screw threaded engage- -ment with the piston heads and the other ends abutting against the raceways, tie-rods passing through said sleeves and having a screw-threaded connection with the raceways, said rods projecting through the piston heads and having jam nuts thereon outside of the piston heads to draw the raceways against the sleeves to maintain the raceways in rigid position; and alining pins for the tracks screw threaded into the lugs in the sleeve portion and integral piston head, one end of said pins engaging in recesses or sockets in the raceways, the other ends projecting through the piston heads and having jam nuts to lock the pins in adjusted positions; the pins passing through the lugs in the sleeve portion also serving to connect the releasable head to the sleeve portion of the other head.

WILLARD I. TWOMBLY.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. G. 

